Beanstalk is a simple, fast work queue.

Ultra fast JSON decoder and encoder written in C with Python bindings

Meinheld is a high performance asynchronous WSGI Web Server (based on picoev)

C library for consistent hashing, and langauge bindings

A fast MySQL driver written in pure C/C++ for Python. Compatible with gevent through monkey patching.

a tiny, lightning fast event loop for network applications